Film director J.J. Abrams has joined billionaire George Soros and some of the nation’s biggest labor unions in donating large sums to a superPAC targeting potential Republican vice presidential picks and run by David Brock, founder of the controversial Media Matters for America.

The superPAC American Bridge 21st Century just unveiled a new website this past week called VeepMistakes.com, featuring more than 1,300 pages of purported opposition research and video clips on potential GOP vice presidential candidates.

American Bridge so far has focused its ire on former Minnesota Gov. Tim Pawlenty, Ohio Sen. Rob Portman and Florida Sen. Marco Rubio.

ABC News.com featured a lengthy profile on American Bridge’s new VeepMistake.com website, yet the news article failed to mention that the superPAC was founded by Brock and grew out of Media Matters.

White House staffers reportedly have held regular meetings with Media Matters, which recently came under fire for unusual tactics, including compiling a de facto enemies list; announcing an all-out campaign of “guerrilla warfare and sabotage